The possible causes of small stomach pain during sex are: 1, too nervous, can lead to spasms in the vaginal wall, cervix and other parts of the vagina during sex, causing obvious abdominal pain symptoms, this cause of abdominal pain during sex, only appear in the occasional one-time life. 2, sex after overexertion, due to excessive physical fatigue, mental overexertion, resulting in normal secretions during sex is too little easy to The most common cause of lower abdominal pain during sex is chronic pelvic inflammatory disease, which can also cause varying degrees of lower abdominal and lumbosacral discomfort before and after menstruation. 5, endometriosis, also have the possibility of lower abdominal pain symptoms during sex.